I have a strange Flashlight/Energy Efficient lightbulb attraction that I can't really explain.
I have a couple of LED flashlights in my Truck, along with a Wind-Up one that I test pretty regularly.
I always have a good LED Flashlight in my backpack, and I use it all the time.
I also love the idea of LED household lightbulbs - and I have an awesome Coleman LED lantern that had four detachable LED "Modules" that I keep handy in the event of a power outage. The eight D batteries that power this this will run it for 40 hours straight.